Photosynthesis Flashcards
(35 cards)
What is the Photosynthesis equation?
6CO2 + 6H2O -> C6H12O6 + 6O2.
Sunlight and chlorophyll are the catalysts.
What is photosynthesis?
A process that converts sunlight into a food source (glucose) in plants.
What are starch cellulose and glycogen made up of?
Made up of many many glucose molecules joined together.
The openings in the plant leaves are designed to allow gaseous exchange without allowing excessive water loss are called what?
Stomata.
When does photosynthesis occur?
Only when light, carbon dioxed and chlorophyll are present, usually in the day.
What are some materials that move in and out of the plant through the tiny little pores on the leafs surface?
Oxygen and carbon dioxide.
What are 2 materials that move into the plant through the roots?
Minerals and water. The xylem transports these to the plants leaves.
If there were 4 flasks each with different things inside them eg. plastic plant, pond weed, fish, which one would have the lowest amount of CO2 and why?
The flask with only pondweed because the pond weed would be respiring and using the CO2 up, to produce more water. Therefor causing the level of carbon dioxide to reduce. The plant will keep doing this providing there is sunlight and CO2 available.
What are the 2 products of Photosynthesis?
Oxygen (O2) and glucose (C6H12O6).
What are the 2 reactants of photosynthesis?
Carbon dioxide (CO2) and water (H2O).
What are most cells made up of?
Cells with a few air spaces.
Where do root cells get their food to grow?
Photosynthesis occurs in the leaves of the plant and is transported to the roots in the veins by the phloem.
Where do each of the reactants come from for photosynthesis?
Carbon dioxide: the air surrounding the plant.
Water: absorbed by the roots of the plant, from soil, then transported to leaves in xylem.
Where to each of the products from photosynthesis go?
Oxygen: Gas spaces in the plant, released through the stomata into the outside world.
Glucose: Converted into energy via respiration, stored in the form of starch or transported as sucrose.
What is the purpose of respiration?
To provide energy to the plants. Its used for growing, storing and repairing. The glucose produced is used by respiration to grow and repair.
Where does photosynthesis occur?
In the plants leaves and stem but mainly anywhere where there is chlorophyll. Also occurs in photosynthetic bacteria.
Define chlorophyll.
The green pigment found in leaves and stem of plants, giving it its green appearance. The chlorophyll captures/ absorbs the sunlight (its energy).
What are guard cells?
Cells that change the size of the stomata openings , allowing it to open and close. It controls the stoma and therefore controls when gases come in and out.
What is a chloroplast?
Structure in the plant that contains the chlorophyll. Photosynthesis takes place here.
Define Palisade.
Middle layer if the leaves. Tightly packed and contains large amounts of chloroplasts so a large amount of photosynthesis takes place here.
Define a xylem cell.
Transports water from the roots of the plant to the leaves in order for photosynthesis to occur, supplies water to the leaf.
Define stomata.
A small opening in the leafs surface, Plants breathe through the stoma. It lets gases in and out (CO2 and O2).
Define cuticle.
A waxy repellent layer that covers all of the above part of the leaf. Prevents and reduces water loss. therefore conserves the plants water.
Upper and lower epidermis definition.
Upper: provides protection for the plant. Is the transparent layer of the leaf that acts like a skin.
Lower: transparent layer of the leaf that acts like a skin. Contains guard cells and stoma.
